it's a little thing and easy to ignore, but thought I'd report it anyway in the second room upstairs in my sun palace, the one with a kroktopia theme, i had previously placed an oar against the wall. the oar can now no longer be selected or move, but it's still there. it's a very small thing and easily overlooked so i don't really care.
Thanks for letting us know but if you are still attempting to pick up the item, you can see all the currently hooked items by opening your attic and clicking the House tab when you are in furniture placement mode.
Then simply select the item you're trying to remove and place it in your backpack.